高等学校化学学报2021，Vol.42Issue(1)：11-20,10.DOI:10.7503/cjcu20200476
羟基自由基在沸石分子筛合成中的作用
Roles of Hydroxyl Radicals in Zeolite Synthesis
摘要
Abstract
Zeolites have been widely utilized in chemical industry as the most important solid catalysts because of their tunable acidities and shape selective catalysis. Synthesis of zeolites is usually performed via hydrothermal crystallization in a strong basic medium. Hydroxide ions(OH-)are considered to catalyze the depolymerization and polymerization of the silicate and aluminate species. Recently,it was found that the hydroxyl radicals(·OH)existed in the hydrothermal synthesis system. By using physical or chemical methods such as ultraviolet irradiation and Fenton's reagent,·OH radicals can be introduced into the zeolite synthesis system,which remarkably accelerated the zeolite crystallization and promoted the formation of zeolites with higher SiO2/Al2O3 ratio. Density functional theory calculations demonstrated that ·OH radicals significantly facilitated the depolymerization of the aluminosilicate gel by breaking the Si—O—Si bonds and the polymeriza-tion of the aluminosilicate anions around the hydrated cation species by remaking the Si—O—Si bonds,thus speeding up the nucleation and favoring Si incorporation into the zeolite frameworks. This review summarizes the recent progress in the application of·OH radicals in the synthesis of zeolites,with an emphasis on the role and advantage of·OH radicals in zeolite crystallization. The future perspective of the·OH radical route for the synthesis of zeolites is pointed out.关键词
沸石分子筛/羟基自由基/水热合成/硅铝比Key words
Zeolite/·OH radical/Hydrothermal synthesis/Silica to alumina ratio分类
化学化工引用本文复制引用
王健羽,张强,闫文付,于吉红..羟基自由基在沸石分子筛合成中的作用[J].高等学校化学学报,2021,42(1):11-20,10.基金项目
国家自然科学基金(批准号:21920102005, 21621001, U1967215)资助.This paper is supported by the National Natural Science Foundation of China(Nos. 21920102005, 21621001,U1967215). （批准号:21920102005, 21621001, U1967215）
